Outdoor-Indoor

Hi forum guys! :thumbsup:
Someone is currently changing hes plants from outdoor to indoor because of stealth reasons...
The plants are WHITE ICE and PPP.(awesome stuff :) )
The plants have been getting DIRECT SUNLIGHT ALL DAY. That means somewhere between 10-13Hrs light per day.
Now he wants to place them inside, but the light is less.
He is going to place a transparent plastic so that light hits the plants, and some white walls so that light gets reflected.
He believes he needs to get some electrical light also.At least 4 hours per day electrical light and all the rest will be sun light =)
He was wondering if that would be OK for the plants?
And he is also wondering if he could use 2 HID Sodium bulbs, each one of them is 170W. That would be 340W for 5 hrs per day +the natural sunlight. |Sunlight would start at 6am untill 5pm and from 5pm to 10pm would be the 340W HID light.
Does that sound good?

Ooo.
Forgot to say that the indoor spot has 70-80%humidity and 23-29 Celsius

Update: The 2 170W HID Sodium will be replaced for a single 500W bulb.
What do u guys think about it? Will the plants be happy?